docs: 更新设计文档

assets/docs/dataflow.md

@@ -8,7 +8,7 @@ AstrAI adopts a modular design with the following main components:
 - **Dataset Module** (`astrai/dataset/`): Dataset, sampler, serialization tools
 - **Model Module** (`astrai/model/`): Transformer model and its submodules
 - **Training Module** (`astrai/trainer/`): Trainer, training context, strategies, schedulers
-- **Inference Module** (`astrai/inference/`): Generation core, KV cache management, streaming generation
+- **Inference Module** (`astrai/inference/`): Inference engine with continuous batching, streaming generation
 - **Config Module** (`astrai/config/`): Model, training, scheduler, and other configurations
 - **Parallel Module** (`astrai/parallel/`): Distributed training support
 
@@ -45,11 +45,11 @@ flowchart LR
         C1[Checkpoint] --> C2[ModelParameter]
         C2 --> C3[Transformer + BpeTokenizer]
         C3 --> C4[GenerationRequest + build_prompt]
-        C4 --> C5[GeneratorFactory]
-        C5 --> C6[GeneratorCore]
+        C4 --> C5[InferenceEngine]
+        C5 --> C6[InferenceScheduler]
         C6 --> C7[apply_sampling_strategies]
         C7 --> C8[Transformer Forward]
-        C8 --> C9[KVCacheManager]
+        C8 --> C9[KV Cache]
         C9 --> C10{End Condition?}
         C10 -->|No| C8
         C10 -->|Yes| C11[Output Text]
@@ -124,22 +124,21 @@ flowchart LR
 
 ### 4. Inference Module
 
-#### 4.1 Generation Core (`core.py`)
-- **`GeneratorCore`**: Provides `generate_iterator` method, executes single-step generation
-- Applies sampling strategies (temperature, top-k, top-p) to filter logits
-- Supports KV cache to accelerate autoregressive generation
+#### 4.1 Inference Engine (`engine.py`)
+- **`InferenceEngine`**: Unified inference interface, supports streaming and non-streaming generation
+- **`InferenceScheduler`**: Continuous batching scheduler with dynamic batch composition
+- Manages task queue (`waiting_queue`, `active_tasks`) and KV cache allocation
 
-#### 4.2 KV Cache Management (`core.py`)
-- **`KVCacheManager`**: Manages K and V cache for each layer, supports batch generation and length extension
-- Cache shape is `[batch_size, n_kv_heads, seq_len, head_dim]`
+#### 4.2 Scheduler (`scheduler.py`)
+- **`Task`**: Individual generation task with state management (PENDING, RUNNING, FINISHED, ABORTED)
+- **`TaskStatus`**: Task state enumeration
+- **`apply_sampling_strategies`**: Applies temperature, top-k, top-p sampling to logits
+- Continuous batching: new requests can join at any time, completed requests are released immediately
 
-#### 4.3 Generator (`generator.py`)
-- **`GenerationRequest`**: Encapsulates generation request parameters (top_k, top_p, temperature, max_len, query, history, etc.)
+#### 4.3 Request (`engine.py`)
+- **`GenerationRequest`**: Encapsulates generation parameters (top_k, top_p, temperature, max_len, query, history, etc.)
 - **`build_prompt`** (from `chat_template.py`): Converts query and history into ChatML format prompt string
-- **`GeneratorCore`**: Base generator with generate_iterator and generate_loop methods
-- **`LoopGenerator`**, **`StreamGenerator`**, **`BatchGenerator`**: Different generation modes
-- **`pad_sequence`**: Pads input IDs to consistent length
-- Provides streaming and non-streaming generation interfaces
+- Provides streaming (`stream=True`) and non-streaming (`stream=False`) generation interfaces
 
 ## Training Data Flow - Detailed Steps
 

assets/docs/design.md

@@ -311,41 +311,59 @@ classDiagram
     }
 
     namespace astrai.inference {
-        class GeneratorCore {
+        class InferenceEngine {
             +ModelParameter parameter
-            +generate_iterator(input_ids, temperature, top_k, top_p, attn_mask, kv_caches, start_pos) Tuple~Tensor, int~
-            +generate_loop(input_ids, ids, temperature, top_k, top_p, attn_mask, kv_caches, start_pos, callback) List~int~
+            +InferenceScheduler scheduler
+            +generate(prompt, stream, max_tokens, temperature, top_p, top_k) Union[Generator, str, List[str]]
+            +generate_with_request(request) Union[Generator, str, List[str]]
+            +get_stats() Dict
+            +shutdown()
         }
 
-        class LoopGenerator {
-            +generate(request) str
-        }
-
-        class StreamGenerator {
-            +generate(request) Generator
-        }
-
-        class BatchGenerator {
-            +generate(request) List~str~
-        }
-
-        class EmbeddingEncoder {
-            +encode(sentence) Tensor
-        }
-
-        class KVCacheManager {
-            +int batch_size
+        class InferenceScheduler {
+            +nn.Module model
+            +Tokenizer tokenizer
+            +ModelConfig config
             +Tuple kv_cache
             +Tensor seq_mask
-            +get_kvcache() Tuple
-            +get_seq_mask() Tensor
-            +update(active_mask)
-            +reset(full_reset)
+            +List waiting_queue
+            +List active_tasks
+            +add_task(prompt, max_tokens, temperature, top_p, top_k, stream_callback) str
+            +remove_task(task_id)
+            +start()
+            +stop()
+            +get_stats() Dict
         }
 
-        class GeneratorFactory {
-            +create(parameter, request) GeneratorCore
-            +create_encoder(parameter) EmbeddingEncoderCore
+        class Task {
+            +str task_id
+            +List prompt_ids
+            +int max_tokens
+            +float temperature
+            +float top_p
+            +int top_k
+            +TaskStatus status
+            +List output_ids
+            +int input_tokens
+            +int output_tokens
+            +int slot
+            +Callable stream_callback
+            +is_finished(stop_ids) bool
+        }
+
+        class TaskStatus {
+            +str PENDING
+            +str RUNNING
+            +str FINISHED
+            +str ABORTED
+        }
+
+        class apply_sampling_strategies {
+            +Tensor logits
+            +float temperature
+            +int top_k
+            +float top_p
+            +forward() Tensor
         }
 
         class Server {
@@ -396,28 +414,25 @@ classDiagram
     BaseStrategy <|-- SFTStrategy
     BaseStrategy <|-- DPOStrategy
     BaseStrategy <|-- GRPOStrategy
+    DPOStrategy --> Transformer : creates ref_model
+    GRPOStrategy --> Transformer : creates ref_model
     SchedulerFactory ..> BaseScheduler : creates
     BaseScheduler <|-- CosineScheduler
     BaseScheduler <|-- SGDRScheduler
     CallbackFactory ..> TrainCallback : creates
-    GeneratorFactory ..> GeneratorCore : creates
-    GeneratorCore <|-- LoopGenerator
-    GeneratorCore <|-- StreamGenerator
-    GeneratorCore <|-- BatchGenerator
-    GeneratorCore <|-- EmbeddingEncoder
-    LoopGenerator --> KVCacheManager : uses
-    StreamGenerator --> KVCacheManager : uses
-    BatchGenerator --> KVCacheManager : uses
-    GeneratorCore --> Transformer : uses
-    DPOStrategy --> Transformer : creates ref_model
-    GRPOStrategy --> Transformer : creates ref_model
-    Server --> GeneratorFactory : uses
+    InferenceEngine --> InferenceScheduler : uses
+    InferenceScheduler --> Task : manages
+    InferenceScheduler --> TaskStatus : uses
+    InferenceScheduler --> apply_sampling_strategies : uses
+    InferenceScheduler --> Transformer : uses
+    InferenceEngine --> Transformer : uses
+    InferenceEngine --> GenerationRequest : uses
+    Server --> InferenceEngine : uses
     ParallelSetup --> Trainer : enables
     TrainConfig --> StrategyFactory : selects
     ModelParameter --> Transformer : contains
     ModelParameter --> BpeTokenizer : contains
     ModelParameter --> ModelConfig : contains
-    GeneratorFactory --> GenerationRequest : uses
     BaseDataset <|-- SEQDataset
     BaseDataset <|-- SFTDataset
     BaseDataset <|-- DPODataset
@@ -446,7 +461,7 @@ classDiagram
 | **astrai.model** | Transformer, DecoderBlock, GQA, MLP, RMSNorm, Linear, RotaryEmbedding, Embedding | Neural network model |
 | **astrai.tokenize** | Tokenizer, BpeTokenizer | Tokenizer |
 | **astrai.trainer** | Trainer, TrainContext, TrainContextBuilder, BaseStrategy, StrategyFactory, BaseScheduler, SchedulerFactory, TrainCallback, CallbackFactory | Training workflow management |
-| **astrai.inference** | GeneratorCore, LoopGenerator, StreamGenerator, BatchGenerator, EmbeddingEncoder, KVCacheManager, GeneratorFactory, Server, GenerationRequest | Inference service |
+| **astrai.inference** | InferenceEngine, InferenceScheduler, Task, TaskStatus, Server, GenerationRequest | Inference service with continuous batching |
 | **astrai.parallel** | ParallelSetup, ColumnParallelLinear, RowParallelLinear | Distributed parallel |
 
 ### Design Patterns
@@ -455,17 +470,19 @@ classDiagram
 |---------|---------|---------|
 | **Strategy** | `BaseStrategy`, `SEQStrategy`, `SFTStrategy`, `DPOStrategy`, `GRPOStrategy`, `StrategyFactory` | Flexible training strategy switching, supports SEQ/SFT/DPO/GRPO |
 | **Builder** | `TrainContextBuilder` | Chain-building training context, step-by-step initialization of components |
-| **Factory** | `StrategyFactory`, `SchedulerFactory`, `DatasetFactory`, `GeneratorFactory`, `CallbackFactory` | Decorator registration mechanism, dynamically create training strategies, schedulers, datasets, generators, and callbacks |
+| **Factory** | `StrategyFactory`, `SchedulerFactory`, `DatasetFactory`, `CallbackFactory` | Decorator registration mechanism, dynamically create training strategies, schedulers, datasets, and callbacks |
 | **Observer** | `TrainCallback`, `CallbackFactory` | Callback mechanism for training process monitoring (checkpoint, early stopping, metrics) |
 | **Singleton** | `TrainContext` | Training process global state management |
 | **Registry** | `BaseFactory`, `Registry` | Generic component registration with category and priority support |
+| **Producer-Consumer** | `InferenceScheduler`, `Task`, `waiting_queue`, `active_tasks` | Continuous batching with dynamic task queue management |
+| **Event-Driven** | `threading.Event`, `_task_event` | Non-blocking wait mechanism for task scheduling using Python's `threading` module |
 
 ### Core Relationships
 
 1. **Configuration → Training**: `TrainConfig` contains `ModelConfig`, holds model, dataset, optimizer and other references
 2. **Training Flow**: `Trainer` → `TrainContextBuilder` → `TrainContext`, uses `BaseStrategy` to compute loss
 3. **Strategy Selection**: `StrategyFactory` creates corresponding strategy instance based on `train_type`
-4. **Inference Flow**: `Server` → `GeneratorFactory` → `GeneratorCore` → `Transformer`, supports multiple generators (LoopGenerator, StreamGenerator, BatchGenerator)
+4. **Inference Flow**: `Server` → `InferenceEngine` → `InferenceScheduler` → `Transformer`, supports continuous batching with streaming/non-streaming
 5. **Distributed Support**: `ParallelSetup` provides multi-process training capability for `Trainer`
 6. **Dataset Loading**: `DatasetFactory` creates datasets (SEQDataset, SFTDataset, DPODataset, GRPODataset), supports HDF5 loading via `BaseSegmentFetcher` and `MultiSegmentFetcher`
 7. **Checkpoint Management**: `Checkpoint` handles model state serialization/deserialization with safetensors

assets/docs/params.md

@@ -83,15 +83,15 @@
 ### Usage Example
 
 ```python
-from astrai.config.param_config import ModelParameter
-from astrai.inference.generator import StreamGenerator, GenerationRequest
+from astrai.config import ModelParameter
+from astrai.inference import InferenceEngine, GenerationRequest
 
 # Load model
 param = ModelParameter.load("your_model_dir")
 param.to(device="cuda", dtype=torch.bfloat16)
 
-# Create generator
-generator = StreamGenerator(param)
+# Create engine
+engine = InferenceEngine(param)
 
 # Build request
 request = GenerationRequest(
@@ -102,14 +102,14 @@ request = GenerationRequest(
     top_k=50,
 )
 
-# Generate
-response = generator.generate(request)
+# Generate (streaming)
+for token in engine.generate_with_request(request):
+    print(token, end="", flush=True)
 ```
 
-### Three Types of Generators
+### Generation Modes
 
-| Generator | Usage |
-|-----------|-------|
-| `StreamGenerator` | Streaming output, returns word by word |
-| `LoopGenerator` | Non-streaming output, returns at once |
-| `BatchGenerator` | Batch generation, processes multiple queries simultaneously |
+| Mode | Description |
+|------|-------------|
+| `stream=True` | Streaming output, yields token by token |
+| `stream=False` | Non-streaming output, returns complete result |